Lay Betting
Betting against an outcome on a betting exchange — effectively acting as the bookmaker by accepting someone else's bet.
How It Works
When you lay a bet, you’re saying “this outcome will NOT happen.” If the outcome doesn’t happen, you keep the backer’s stake (minus exchange commission). If it does happen, you pay out the backer’s winnings. This is the opposite of a traditional (back) bet.
Lay liability = (Lay Odds - 1) × Stake
Practical Example
You lay Manchester United to win at 3.00 for a $100 stake on Betfair:
- If Man United loses or draws: You win $100 (minus ~2% commission) = $98 profit
- If Man United wins: You pay out $200 (liability = (3.00 - 1) × $100)
Your maximum risk is $200, but you win in two out of three possible outcomes (draw or opposition win).
Why It Matters for Bettors
Lay betting opens up strategies that are impossible with traditional sportsbooks:
- Matched betting, Lay bets cancel out risk on qualifying bets, enabling risk-free bonus extraction
- Trading, Back at high odds, then lay at lower odds (or vice versa) to lock in profit as odds move
- Opposing favorites, Laying short-priced favorites can be profitable when the market overvalues them
Without lay betting, strategies like matched betting and sports trading wouldn’t exist in their current form.
Key Differences from Back Betting
| Back Bet | Lay Bet | |
|---|---|---|
| You want | Outcome to happen | Outcome NOT to happen |
| You risk | Your stake | Lay liability |
| You win | Odds × Stake - Stake | Backer’s stake |
| Platform | Sportsbook or exchange | Exchange only |
Where to Place Lay Bets
- Betfair Exchange, The world’s largest betting exchange with deep liquidity
- Smarkets, Lower commission (2%) than Betfair, growing market depth
- Betdaq, Alternative exchange popular in UK and Ireland
- Prophet Exchange, US-based exchange available in New Jersey